为什么这么称呼伪类? [英] Why is a pseudo-class so called?

问题描述

a:hover

为什么将其称为伪类"?

类"的概念有何相似之处?

解决方案

用CSS术语来说，类是一个以句号开头的选择器，例如

.foo { ... }

它将以以下形式使用

<div class="foo">

这种类别"的使用，更多的是具有共同特征并通过种类或质量与其他事物区别的一组事物或类别"，而不是借用面向对象的术语.

伪类不是真正的类"，因为用户代理定义了何时和/或多少内容符合条件(例如:hover，:active等).

a:hover

Why is it called a "pseudo-class"?

Are there any similarities with the concept of "class"?

解决方案

In CSS terms, a class is a selector that starts with a full stop, e.g.

.foo { ... }

It would be used in the form

<div class="foo">

This use of "class" is more in the sense "a set or category of things having a common characteristic and differentiated from others by kind or quality", rather than borrowing from OO terminology.

A pseudo class is "not quite a real one" as the user agent defines when and/or how much content qualifies (like :hover, :active, etc).

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